Improvement in scaffolds



L G nn AU B W Scaiol d.

Patented May 25.1875.

INVENTOR v ATTORNEYS WlTN ESSES M/M@ gi 6?! m6, dy u@ UNITED STATESPATENT OFFICE.

WILLIAM BURGE, OF MAUMEE, ASSIGNOR OF ONE-HALF HIS RIGHT TO TIMOTHY W.RYAN, OF SOUTH TOLEDO, OHIO.

IMPROVEMENT IN SCAFFOLDS.

Specification forming part of Letters Patent No. 163,733, dated May 25,1875; application led April 24, 1875.

To all whom Ait may concern:

' of a perspective view of my scaffold; and Fig.

2 is a detail View of the same.

My invention relates to a scaffolding; and it consists in the novelmeans hereinafter described and claimed for elevating and securing beamsfor platforms or other uses, at any desirable altitude. v

.The letters A of the drawings represent two frames, usually constructedin a triangular form, as shown, and having their upright posts securedtogether by means of bolts c. In the central portion of these frames Iarrange two upright posts, cl d', upon cross-bars e e', and secure theirsummits in cap-pieces ff, as shown. Passing through these posts d, andsecured therein by means of nuts, are the removable threaded bolts g.These bolts g and the bolts c serve as supports for the crossbeam B,hereinafter mentioned, and also for the braces, by which said beam issustained and strengthened. B represents my cross-bar, which serves as asupporting-beam for scaffolding, or any like purposes. The ends of thisbeam rest, respectively, upon bolts g or c, above mentioned, two of theframes described being provided for that purpose. D represents mybraces. They are constructed in the form shown in Fig. l, and arearranged in such manner that their lower ends, being of sleeve shape,shall clasp around a bolt, c or g, and be removable by removing saidbolts, or otherwise. The upper ends of these braces are bifurcated, andso constructed that they may be clamped firmly to the cross-beam bymeans of a spur on one side and a pointed and threaded crank-pin on theother. On the inner sides of the uprights d d I form grooves, shown at hon Fig. l, and arrange therein slides marked y. These slides have,respectively, on their lower edges, spurs marked c, and they are movedupward or downward' at will, in the grooves or channels It.

To arrange the cross-beam at any desired altitude, and secure it inposition, I take two of the frames described and lit't the ends of saidbeam upon the bolts I may elect. I then swing the braces D upward, andattach their upper ends to the beam irmly by means ot' the crank-pin,and the spurs in the opposite sides of the jaws. These braces beingsleeved around the bolts are substantially pivoted thereto, as well asadjustable and removable. I next force the spurs on the slides y intothe top of the beam by a blow of a hammer, and the beam becomes securelyand rigidly attached to the frames.

For any purpose requiring only a single beam, two, only, of the frames,are required; but for the purpose of forming a bed for ascat'tbld-iioor, four frames are necessary.

Vhat l claim as new, and desire to secure by Letters Patent, is-

1. The frames A, constructed with central posts d d', and removablebolts g, substantially as and for the purpose specified.

2. The combination ot' the slides y, having spurs o, and working ingrooves h, with the removable braces D, substantially as and for thepurpose specified.

In testimony that I claim the above I have hereunto subscribed my nainein the presence of two witnesses.

WILLIAM BURGE. Witnesses:

P. C. HoLT, J. E. WILcox.

